第一、第二Rytov近似下的大气相互相干函数及其与强涨落理论的比较
The Atmospheric Mutual Coherence Function from the First and Second Rytov Approximations and its Comparison to That of Strong Fluctuation Theory
摘要：
在Rytov近似下，导出了电磁波在大气湍流中传输的互相干函数表达式。它表明，第一和第二Rytov近似是必需的。然后将Rytov MCF与强涨落理论的抛物方程方法的结果进行了比较。在弱涨落情况下，这种一致性相当好。然而，观察到的不稳定性的特殊情况下，束波强度。不稳定性的来源被确定为梁波幅的Rytov方法内处理的特征方式。
英文摘要：
An expression for the mutual coherence function (MCF) of an electromagnetic beam wave propagating through atmospheric turbulence is derived within the confines of the Rytov approximation. It is shown that both the first and second Rytov approximations are required. The Rytov MCF is then compared to that which issues from the parabolic equation method of strong fluctuation theory. The agreement is found to be quite good in the weak fluctuation case. However, an instability is observed for the special case of beam wave intensities. The source of the instabilities is identified to be the characteristic way beam wave amplitudes are treated within the Rytov method.
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